Test O

PINPOINT TEST O: THE AUXILIARY BLOWER MOTOR IS INOPERATIVE

Test O1:

Test O2-O4:

Test O5-O7:

Test O8-O10:

Test O11-O12:

Normal Operation
Under normal operation, the auxiliary blower motor relay coil receives ignition voltage through circuit 181 (BN/OG). The coil receives ground from the Smart Junction Box (SJB) through circuit 1371 (TN/OG) if any blower switch position but OFF is selected. Voltage is supplied to the relay switch contact through circuit 181 (BN/OG). When the relay coil is energized, voltage is delivered to the blower motor through circuit 536 (BK/LG). Ground for the blower motor is provided through circuit 515 (OG/RD) from the blower motor resistor (LO and MED-LO) and the blower motor speed relay 1 (MED-HI and HI). The blower resistor is grounded through circuit 1205 (BK).

Possible Causes
- An open in circuit 181 (BN/OG), 1371 (TN/OG), 1205 (BK), 536 (BK/LG) or 515 (OG/RD).
- Blower motor.
- Blower motor relay.
- Blower motor resistor.